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server.js
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server.js
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"use strict";
/******** Imports ********/
const babel = require("babel-core");
const bodyParser = require("body-parser");
const codeHighlight = require("./codeHighlight");
const exphbs = require("express-handlebars");
const express = require("express");
const fs = require("fs");
const markdown = require("markdown").markdown;
const {MongoClient, ObjectId} = require("mongodb");
const path = require("path");
/******** Setup ********/
const app = express();
const hbs = exphbs.create({
helpers: {
multThree: i => i > 2 && i % 3 === 0,
highlight: txt => codeHighlight.parse(txt),
lines: s => s.split(/\r?\n/gm)
}
});
const port = +process.env.PORT ? +process.env.PORT : 3000;
const babelCache = {};
const mongoHost = process.env.MONGO_HOST;
const mongoPort = +process.env.MONGO_PORT ? +process.env.MONGO_PORT : 27017;
const mongoUser = process.env.MONGO_USER;
const mongoPassword = process.env.MONGO_PASSWORD;
const mongoDbName = process.env.MONGO_DB;
const mongoUrl =
"mongodb://" +
mongoUser +
":" +
mongoPassword +
"@" +
mongoHost +
":" +
mongoPort +
"/" +
mongoDbName;
let mongoDb;
console.log("== MongoDB URL:", mongoUrl);
/******** Pre-processing for converting Markdown to docs ********/
const htmlEntities =
[ [/</g, "<"]
, [/>/g, ">"]
, [/&/g, "&"]
, [/"/g, '"']
, [/'/g, "'"]
, [/¢/g, "¢"]
, [/£/g, "£"]
, [/</g, "<"]
, [/>/g, ">"]
, [/&/g, "&"]
, [/"/g, '"']
, [/'/g, "'"]
, [/¢/g, "¢"]
, [/£/g, "£"]
];
function unescapeHtmlEntities(str) {
return htmlEntities.reduce(
(accu, ent) => accu.replace(ent[0], ent[1]),
str
);
}
const tripleTickRe = /```[a-z]+/g;
const codeBlockRe = /```[\s\S]+?```/g;
const linkRe = /<a href="(.+?)">(.+?)<\/a>/g;
const startPreRe = /\?pre/g;
const endPreRe = /!pre/g;
const brokenMdParserFix = /<p>\?pre<code><\/code>`([\s\S]+?)<code><\/code>`!pre<\/p>/g;
const codeRe = /<code>([\s\S]+?)<\/code>/g;
const allLineStarts = /^/gm;
const readmeContent =
fs.readFileSync("./public/README.md", "utf8")
.replace(tripleTickRe, "```")
.replace(codeBlockRe, "?pre$&!pre");
function highlightCodeBlock(match, p1) {
try {
const highlighted =
"<code>" +
codeHighlight.parse(unescapeHtmlEntities(p1)) +
"</code>";
return highlighted.replace(allLineStarts, " ");
} catch (e) {
return match.replace(allLineStarts, " ");
}
}
const pTagRe = /<\/?p>/g;
function brokenMdParserRepl(match, p1) {
return "<p>?pre<code>" + p1.replace(pTagRe, "") + "</code>!pre</p>";
}
let readmeHtml =
markdown
.toHTML(readmeContent)
.replace(brokenMdParserFix, brokenMdParserRepl)
.replace(codeRe, highlightCodeBlock)
.replace(linkRe, '<a href="$1" target="_blank">$2</a>')
.replace(startPreRe, '<pre class="snippet-pre">')
.replace(endPreRe, "</pre>")
.replace("<h1>Schönfinkel</h1>", "");
const codepageHtml =
fs.readFileSync(
path.join(
__dirname,
"views",
"partials",
"codepage.handlebars"
),
"utf8"
)
.replace(codeRe, highlightCodeBlock);
const bootstrapRepls =
[ [/!!!info!!!([\s\S]+?)!!!\/info!!!/g, '<div class="alert alert-info" role="alert">$1</div>']
, [/!!!hide!!!([\s\S]+?)!!!\/hide!!!/g, "$1"]
, [/!!!button!!!\s*(<a href="[\s\S]+?")>([\s\S]+?)<\/a>\s*!!!\/button!!!/g, '$1 class="btn btn-info btn-block" role="button">$2</a>']
, [/!!!warn!!!([\s\S]+?)!!!\/warn!!!/g, '<div class="alert alert-warning" role="alert">$1</div>']
, [/!!!codepage!!!/g, codepageHtml.replace(/\$/g, "$$$$")]
];
readmeHtml = bootstrapRepls.reduce(
(accu, repl) => accu.replace(repl[0], repl[1]),
readmeHtml
);
const codeTagRe = /<\/?code.*?>/g;
const spanTagRe = /<\/?span.*?>/g;
const docContents = (() => {
const dc = [];
const headerRe = /<h1>([^\n]+?)<\/h1>/;
let lastHeader = "<h1>Schönfinkel Documentation</h1>";
while (readmeHtml.length > 0) {
const lastHeaderName = headerRe.exec(lastHeader)[1];
const headerMatch = headerRe.exec(readmeHtml);
if (!headerMatch) {
dc.push(
[ lastHeaderName
, lastHeader + readmeHtml
]
);
break;
}
dc.push(
[ lastHeaderName
, lastHeader + readmeHtml.slice(0, headerMatch.index)
]
);
lastHeader = headerMatch[0];
readmeHtml =
readmeHtml.slice(headerMatch.index + headerMatch[0].length);
}
return dc;
})();
const docHeaders =
docContents.map(
dc => dc[0].replace(codeTagRe, "").replace(spanTagRe, "")
).slice(1);
/******** Pre-processing for showing random highlighted ********/
/******** code snippets on the index page ********/
const codeSnippetSelection = [
"f b=[|i>j→-2|i<j→1|→0¦(i,j)←b\n-- :: Integral i => [(i, i)] -> [i]",
"f=(Δ1).L -- get length and subtract 1\ng=f[8..1 -- g=7",
'("!-",,"-!")↵[0..2\n-- [("!-", 0, "-!"), ("!-", 1, "-!"), ("!-", 2, "-!")]',
"Σ$(Nb/)↵[1..Nb\n-- Sum harmonic series, where\n-- `b` is the first command-line argument\n-- [of type String]",
"r=[0..9\n['|':(r≫=\\i→[|(iΔb,jΔc)∈[1,2,0,1,2]⊠[0,1,2,2,2]→'*'|→'_','|'])¦j←r\n-- Emit a 'Game of Life' glider on a 10x10 grid",
"n=[0..7\nPS⤔[[H$((i,j)∈)⊙V(\\s_→A(\\(z,w)→z∈n&&w∈n)$(\\(a,b)→F(\\c d→(a+c,b+d))[1,1,-1,-1,-2,-2,2,2][2,-2,2,-2,1,-1,1,-1])=≪s)[(Nb,Nc)]n¡0+48¦j←n]¦i←n\n-- Full program printing map of number of moves required\n-- by a knight to arrive at all places on the chessboard\n-- starting from the coordinates supplied as arguments"
];
function fisherYates(array) {
const a = array.slice();
for (let i = a.length - 1; i > 0; --i) {
const j = Math.floor((i + 1) * Math.random());
const old = a[i];
a[i] = a[j];
a[j] = old;
}
return a;
}
function getRandomCodeSnippets(count) {
return fisherYates(codeSnippetSelection)
.slice(0, count)
.map(codeHighlight.parse);
}
/******** Setup for button pad on editor page ********/
const exoticChars = "⊛→←≡≢¬⊙⩖⤔∈⁂⅋≫≪∩∪Σ↵⊢¦∀∃⟨⟩¡⟥Δ⌊×⊠÷⋄".split("");
const exoticCharRows = exoticChars.reduce(
(accu, chr) => {
const row = accu[0];
const index = accu[1];
if (index % 3 === 0) {
row.push([]);
}
row[row.length - 1].push(chr);
return [row, index + 1];
},
[[], 0]
)[0];
/******** Request handling with middleware ********/
app.engine("handlebars", hbs.engine);
app.set("view engine", "handlebars");
app.use(bodyParser.json());
app.get("/docs", (req, res) => {
const active = 0;
res.render("docs", {
miniTopRow: true,
miniTopRowOffset: 3,
docHeaders: docHeaders.map((h, i) => {
return {
title: h,
active: false,
docIndex: i + 1
};
}),
docContent: docContents[active][1],
prev: {
title: "Schönfinkel Documentation",
docIndex: 0
},
next: {
title: docHeaders[active],
docIndex: 1
}
});
});
app.get("/docs/:docNum", (req, res) => {
const active = +req.params.docNum;
if (!(active in docContents)) {
res.status(404).render("404Page");
return;
}
res.render("docs", {
miniTopRow: true,
miniTopRowOffset: 3,
docHeaders: docHeaders.map((h, i) => {
return {
title: h,
active: i + 1 === active,
docIndex: i + 1
};
}),
docContent: docContents[active][1],
prev: {
title: active > 1 ?
docHeaders[active - 2] :
"Schönfinkel Documentation",
docIndex: Math.max(active - 1, 0)
},
next: {
title: docHeaders.length > active ?
docHeaders[active] :
"",
docIndex: active + 1
}
});
});
app.get("/editor", (req, res) =>
res.render("editor", {
miniTopRow: true,
miniTopRowOffset: 1,
exoticCharRows,
code: ""
})
);
app.get("/editor/:snippetId", (req, res) => {
const snippetId = req.params.snippetId;
const collection = mongoDb.collection("snippets");
const _id = (() => {
try {
return ObjectId(snippetId);
} catch (e) {
return;
}
})();
if (!_id) {
res.render("editor", {
miniTopRow: true,
miniTopRowOffset: 1,
exoticCharRows,
code: ""
});
return;
}
collection
.find({ _id })
.next((err, result) => {
if (err || !result) {
res.render("editor", {
miniTopRow: true,
miniTopRowOffset: 1,
exoticCharRows,
code: ""
});
if (err) {
console.log(err);
}
} else {
res.render("editor", {
miniTopRow: true,
miniTopRowOffset: 1,
exoticCharRows,
code: result.code
});
}
});
});
app.post("/editor/addSnippet", (req, res) => {
if (
req.body &&
req.body.author.trim() &&
req.body.code &&
req.body.description.trim() &&
req.body.title.trim()
) {
if (req.body.author.length > 24) {
res.status(400).send(
"Author of snippet must not exceed 24 characters."
);
return;
}
if (req.body.code.length > 5000) {
res.status(400).send(
"Code snippet must not exceed 5000 characters."
);
return;
}
if (req.body.description.length > 1000) {
res.status(400).send(
"Description of snippet must not exceed 1000 characters."
);
return;
}
if (req.body.title.length > 36) {
res.status(400).send(
"Title of snippet must not exceed 36 characters."
);
return;
}
const collection = mongoDb.collection("snippets");
const snippet = {
author: req.body.author.trim(),
code: req.body.code,
description: req.body.description.trim(),
title: req.body.title.trim()
};
collection.insertOne(snippet, err => {
if (err) {
console.log(
"== Error storing code snippet (" +
JSON.stringify(snippet) +
") into database:",
err
);
res.status(500).send(
"Error inserting code snippet into database: " +
err
);
} else {
res.status(200).send();
}
});
} else {
res.status(400).send(
"Code snippet must have some code, a title, a description, and an author."
);
}
});
app.get("/sch", (req, res) => {
const filePath = path.join(__dirname, "public", "sch");
res.set("Content-Disposition", "attachment; filename=sch");
res.set("Content-Type", "text/javascript");
const fileStream = fs.createReadStream(filePath);
fileStream.pipe(res);
});
app.get("/download", (req, res) =>
res.render("download", {
miniTopRow: true,
miniTopRowOffset: 1
})
);
app.get("/snippets", (req, res) => {
const collection = mongoDb.collection("snippets");
collection.find({}).toArray((err, snippetData) => {
if (err) {
res.status(500).send("Error fetching code snippets from DB.");
} else {
res.render("snippets", {
miniTopRow: true,
miniTopRowOffset: 1,
snippetData
});
}
});
});
app.get("/snippets/:snippet", (req, res, next) => {
const snippet = req.params.snippet;
const collection = mongoDb.collection("snippets");
collection.find({ snippetid: snippet }).toArray((err, snippetsData) => {
if (err) {
console.log(
"== Error fetching code snippet (" +
snippet +
") from database:",
err
);
res.status(500).send("Error fetching code snippet from DB.");
} else if (snippetsData.length < 1) {
next();
} else {
const snippetData = snippetsData[0];
res.render("editor", {
miniTopRow: true,
miniTopRowOffset: 1,
exoticCharRows,
code: snippetData.code
});
}
});
});
app.get("/", (req, res) => {
const rcs = getRandomCodeSnippets(3);
res.render("indexPage", {
codeSnippets: rcs,
miniTopRow: false
});
});
app.get(/\/[0-9a-zA-Z_\-]+\.js\/?/, (req, res) => {
const filename = req.url.split("/").filter(s => s).pop();
if (filename in babelCache) {
res.send(babelCache[filename]);
return;
}
const filepath = path.join(__dirname, "public", filename);
babel.transformFile(filepath, {}, (err, result) => {
if (err) {
console.log(err);
res.status(500);
return;
}
const code = result.code.replace('"use strict";', "");
babelCache[filename] = code;
res.send(code);
});
});
app.use(express.static(path.join(__dirname, "public")));
app.get("*", (req, res) => res.status(404).render("404Page"));
/******** Finally, start listening ********/
MongoClient.connect(mongoUrl, (err, db) => {
if (err) {
throw err;
}
mongoDb = db;
app.listen(port, () => console.log("== Server listening on port", port));
});